d = {'a': 1, 'b': 2, 'c': 3}
for key, value in d.items():
    print(" key : %s, value : %s" % (key, value))

for i, value in enumerate(['A', 'B', 'C']):
    print(" key : %d, value : %s" % (i, value))

for x, y in [(1, 1), (2, 4), (3, 9)]:
    print(" key : %d, value : %d" % ( x, y))
